东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (5): 642-646.DOI: 10.12068/j.issn.1005-3026.2016.05.008

• 材料与冶金 • 上一篇    下一篇

Nb对奥氏体→铁素体相变动力学影响的模型

刘雪峰1， 贾涛1， 朱本强2   

  1. (1. 东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819;2.The Centre for Metallurgical Process Engineering， The University of British Columbia， Vancouver， BC， Canada V6T 1Z4)
  • 收稿日期:2015-03-17 修回日期:2015-03-17 出版日期:2016-05-15 发布日期:2016-05-13
  • 通讯作者: 刘雪峰
  • 作者简介:刘雪峰(1982-)， 男， 辽宁辽阳人， 东北大学博士研究生.
  • 基金资助:
    国家自然科学基金资助项目(51204048， 51204053)； 辽宁省教育厅科学研究一般项目(L2013112).

Modeling the Effect of Nb on Austenite→Ferrite Phase Transformation Kinetics

LIU Xue-feng1， JIA Tao1， ZHU Ben-qiang2   

  1. 1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China; 2. The Centre for Metallurgical Process Engineering， The University of British Columbia， Vancouver V6T 1Z4， Canada.
  • Received:2015-03-17 Revised:2015-03-17 Online:2016-05-15 Published:2016-05-13
  • Contact: JIA Tao
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摘要： 在热模拟实验中，通过奥氏体区不同时间的等温得到具有不同固溶Nb%、相同晶粒尺寸的奥氏体，然后以1~5K/s冷速冷却至室温获得连续冷却膨胀曲线.在Rios理论推导基础上，开发了一种基于Johnson-Mehl-Avrami- Kolmogorov (JMAK)方程和可加性法则的建模方法.建立了不同固溶Nb%条件下的奥氏体→铁素体相变动力学模型，结果表明，固溶Nb%对指数n没有影响，而动力学参数k随着固溶Nb%的增加而减小，即固溶拖拽效应增强.

关键词: 相变, 动力学模型, Nb, JMAK, 可加性法则

Abstract: In thermal simulation tests， the austenite with the same grain size but different solute Nb% was obtained by holding at austenite region with various times. The dilation curve was recorded when the sample was cooled to room temperature with the cooling rate of 1~5K/s. Originating from Rios’ theoretical deduction， a modeling approach based on the JMAK(Johnson-Mehl-Avrami-Kolmogorov) equation and additivity rule was developed. The kinetic model of austenite to ferrite phase transformation under different solute Nb% was established. The results suggest that the exponential n is not affected by the solute Nb%， whereas the kinetic parameter k decreases with increasing solute Nb% that is an enhanced solute drag effect.

Key words: phase transformation, kinetic model, Nb, JMAK(Johnson-Mehl-Avrami-Kolmogorov), additivity rule

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